Place both broccoli pkgs. in microwave on a paper towel. Microwave at 100% power for 8 - 12 minutes; drain. Arrange spears in a 2 qt. baking dish, alternating heads and stems. In a small bowl, blend soup, 1/2 C. cheese, milk, salt and pepper. Pour over broccoli. Cover with waxed paper and microwave at 100% power 3 - 5 minutes. Sprinkle with remaining cheese and onion rings. Microwave at 100% power for 1 1/2 - 3 minutes.